Rooftop solar companies have a new pitch as they seek to grab a piece of an emerging $50 billion market: Prepare for the worst

Rooftop solar companies have a new pitch as they seek to grab a piece of an emerging $50 billion market: Prepare for the worst

Last October, the rooftop solar and energy storage company Sunrun noticed a huge shift in its California sales.  The number of new customers in the Bay Area who bought the firm’s battery offering, Brightbox, as an add-on to their solar system, doubled — from…
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